Carrie Underwood, a six-time Grammy Award winner who has seen all four of her albums hit No. 1 on the country charts and go platinum, will headline the fair’s grandstand at 7 p.m. Sept. 3, the fair just announced.

She is the first of six headliners to be announced for the fair, which runs Sept. 1-7.

Tickets, at $87 and $67 for reserved seats, will go on sale at 10 a.m. Dec. 13 at the Fair box office, online at Ticketmaster.com, over the phone at 800-745-3000 and at Ticketmaster Centers.

The fair noted tickets will be on sale in time for holiday gifts. Tickets for discount all-day ride wristbands and half-price fair admission also will go on sale with the tickets.

It is the second-earliest a fair headliner has been announced: Only Keith Urban’s 2010 fair show was announced earlier – during the 2009 fair, with his tickets going on sale Nov. 21.

Underwood represents one of the most in-demand talents the fair has ever landed. Last December, she played the lead in NBC-TV's live broadcast of “The Sound of Music,” drawing 44 million viewers, and recently with fellow country star Brad Paisley was host of the Country Music Association Awards for the seventh time.

That added to her acclaim as a singer, songwriter, touring artist and many-time music-industry award winner. She’s nominated for Favorite Female Country by the American Music Awards, which airs at 8 p.m. Sunday, Nov. 23, on ABC-TV.

It will be Underwood’s second performance at the fair. She also headlined in 2007, drawing nearly 7,000 people.

“Carrie was amazing when she last performed here and her star just keeps getting brighter,” fair Marketing Director Bonnie Brosious said. “We can’t wait to welcome her back.”

Underwood also sold out the former 6,500-capacity RiverPlace stage at Bethlehem’s Musikfest festival in 2006.

Underwood’s career started when she won the fourth season of “American Idol” in 2005 and her debut album, “Some Hearts” became the fastest-selling country debut album in Nielsen SoundScan history and as Billboard’s “Top Country Album” of the last decade. It has sold more than 7 million copies.

In all, she’s sold nearly 15 million albums in the United States alone, making her the best-selling artist in “American Idol” history and the fourth-biggest album seller among artists who debuted in the past decade. Every one of her albums since “Some Hearts” also has hit No. 1 on Billboard’s overall albums chart.

She has a greatest-hits album is due out Dec. 9. Its first single, “Something in the Water,” released Sept. 29, already hit No. 1 on both the Country and Christian charts and broke multiple airplay records on country radio in its first week.

Since her first single, “Inside Your Heaven,” hit No. 1 and went gold, Underwood has had 13 No. 1 country songs and four others that peaked at No.2. Twenty of her songs have gone gold or platinum, including duets with Paisley and hitmaker Miranda Lambert.

In all, she’s sold more than 25 million singles in the United States. Among her biggest hits are “Jesus Take the Wheel,” “Before He Cheats,” both Grammy Awards winners for Best Female Country Vocal.

She also has won five Country Music Association Awards, 11 Academy of Country Music Awards, 16 Billboard Music Awards, and seven American Music Awards .

She’s in her second season singing the NBC-TV “Sunday Night Football” theme song and has been on the cover of glamour, celebrity, music and news magazines.

Rolling Stone magazine called her the female vocalist of her generation in any genre, “Billboard” magazine crowned her “Country Music’s reigning Queen” and “Time” magazine listed her among the 100 most influential people in the world in 2014.

As co-host of the CMA awards two weeks ago, Underwood – who is pregnant – revealed she’s having a son. She and hockey player Mike Fisher were married in 2010.